SYNCRO

Univeral Platform for Locking Applications
The modular design of the new locking electronics allows us to configure
the phase lock loop for various locking
tasks. Developed to serve in our opticalfrequency comb systems for repetition
rate and offset frequency stabilization,
it can be used to phase lock various external devices, such as lasers, cavities
or fiber-links, in today’s most demanding experiments.
F e at u r e s■■ Full Automation■■ Proportional Bandwidth >1.0 MHz (-3 dB) (Typ. 1.3 MHz; Effective Bandwidth Depends on other Components in the CompleteControl Loop)■■ User-Friendly Operation■■ Front Panel Touch Screen or Remote Control with PC (RS232 or USB)■■ Track Function: Slow Integrator Ensures Stable Long Term Operation By Coarse Adjustment of Operating Parameters to Compensate
Drifts Due to Change of Ambient Conditions

2 - S ta g e L oc k i ng S c h e m eConventional
Conventional
Locking Scheme
Locking
at Scheme at 2-stage Locking
2-stage
SchemeLocking Scheme
Higher Harmonics
HigherOnlyHarmonics OnlyFirst Locking

First Locking

First Locking

First Locking

After Relock

After Relock

After Relock

After Relock

random phase locking
randomatphase
one oflockingn possible
at one of n possible
well-defined phasewell-defined
relation phase relation
positions in 2πpositions
range (n=inharmonic2π rangenumber)(n= harmonic number)G e n e r i c S ys t e m S c h e m e
CLIENT

Input Section

MonitorPort

Fast Output Section

Slow Output Section

PID Loop AmpliﬁerµController
USB / RS232

User Interface

SYNCRO Platform

The phase relation is defined throughthe fundamental lock. Locking is done
at higher harmonics for superior phasesensitivity.

SYNCRO

Univeral Platform for Locking Applications
RRE-SYNCRORFREFERENCE Repetition Ratephase locks the repetition rate of a pulsed laser to a radio frequency reference, derived from a radio frequency clock. Alternatively, the SYNCRO-RRE can be configured for locking to an
optical reference clock: a beat signal detection unit between thelaser and the optical reference provides the input signal, and a
preamplifier and a digital phase detector is used in the input
section of the electronics.

µController
USB / RS232

Control Voltage
DACDigital Phase Detector

PID Loop AmpliﬁerµController
USB / RS232

RFREFERENCE

User Interface

Pump Power Modulation

Digital Phase Detector
MonitorPortStepper Motor

Stepper Motor Controler

f CEO Preampliﬁer
PID Loop AmpliﬁerµController
USB / RS232SYNCRO Platform

User Interface

FIBER OPTIC LINK
Stepper Motor Controller

Piezo Drive

Stepper Motor ControllerHigh Voltage Ampliﬁer

MonitorPort

PID Loop AmpliﬁerµController
USB / RS232

www.menlosystems.com

SYNCRO Platform

fs LASER

fCEO
DETECTION

LINK LENGTH
DETECTION

Menlo Systems, Inc.
T+1 973 300 4490
ussales@menlosystems.com

User InterfaceSTABILIZED OPTICAL FREQUENCY COMBCW LASER Fast Feedback Slow Feedback

Monitor
PortFLS

Menlo Systems GmbH
T+49 89 189 166 0
sales@menlosystems.com

SYNCRO Platform

Preampliﬁer

XPS800-E

for distribution of stable optical timing signals, stabilizes thelength of the fiber-optic link. The Fiber-Link Stabilization unit
comes complete with an attosecond precision phase detector,
actuators and locking electronics.

Stepper Motor Controller

PID Loop Ampliﬁer

Monitor
PortRF
BEAT SIGNALREFERENCE DETECTION

is the complete electronics part of the XPS800 Femtosecond
Phase Stabilization Unit for the stabilization of the phase relation between carrier and envelope of the pulses emitted froma femtosecond laser. Besides the SYNCRO-based locking electronics, the package includes detectors, RF-Spectrum analyzer
and oscilloscope, and AOM and driver. The stabilization is basedon the frequency comb technology.

Stepper Motor

High Voltage Ampliﬁer

Analog Phase Detector

L L E - S y N C rophase locks the frequency of a CW laser to a stabilized mode ofan optical frequency comb system. Depending on the type of theCW laser, the fast and slow output sections of the electronics
can be configured to provide the right control signal requestedby the CW laser, e.g. piezo drive for the fast and temperature
control for the slow feedback.

PULSED LASER
Piezo DriveSYNCRO Platform

User Interface

Thorlabs, Inc.
T+1 973 579 7227
sales@thorlabs.com

www.frequencycomb.com

D-SYNCRO-EN 28/07/14